Pre-feed cylinderA cylinder placed between the cold water feed and the existing hot water cylinder.

ManifoldAny pipe with several outlets to or from other pipes, or a junction of pipes.

CalorifierA water storage vessel, which has the capability to increase the temperature of the water contained within it.

ControllerThe controller compares the different temperatures at specific locations in the solar systems circuit.

Heat exchangerThe heat exchanger is normally inside the hot water cylinder. It transfers heat in the solar circuit (which has been water warmed by the sun) to the water inside the hot water cylinder/ tank.